CH632408A5 - Reinforcing, filling or HOLD MATERIAL FOR USE IN DENTAL TECHNOLOGY. - Google Patents
Reinforcing, filling or HOLD MATERIAL FOR USE IN DENTAL TECHNOLOGY. Download PDFInfo
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- CH632408A5 CH632408A5 CH320077A CH320077A CH632408A5 CH 632408 A5 CH632408 A5 CH 632408A5 CH 320077 A CH320077 A CH 320077A CH 320077 A CH320077 A CH 320077A CH 632408 A5 CH632408 A5 CH 632408A5
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- filling
- reinforcing
- fibers
- material according
- dental technology
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/12—Tools for fastening artificial teeth; Holders, clamps, or stands for artificial teeth
- A61C13/14—Vulcanising devices for artificial teeth
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/30—Compositions for temporarily or permanently fixing teeth or palates, e.g. primers for dental adhesives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/70—Preparations for dentistry comprising inorganic additives
- A61K6/71—Fillers
- A61K6/77—Glass
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
- A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/40—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material
- A61L27/44—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having a macromolecular matrix
- A61L27/446—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having a macromolecular matrix with other specific inorganic fillers other than those covered by A61L27/443 or A61L27/46
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Dentistry (AREA)
- Plastic & Reconstructive Surgery (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Dermatology (AREA)
- Medicinal Chemistry (AREA)
- Transplantation (AREA)
- Dental Preparations (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
632408 632408
PATENTANSPRÜCHE PATENT CLAIMS
1.Verstärkungs-, Füll- oder Haltematerial zur Verwendung in der Dentaltechnik, dadurch gekennzeichnet, dass es ein poröses, dreidimensionales Netzwerk aus anorganischen Fasern enthält, wobei die Fasern an ihren gegenseitigen Berührungspunkten miteinander verschmolzen sind. 1. Reinforcement, filling or holding material for use in dental technology, characterized in that it contains a porous, three-dimensional network of inorganic fibers, the fibers being fused together at their mutual points of contact.
2. Material gemäss Patentanspruch 1, dadurch gekennzeichnet, dass die Fasern aus Glas sind und einen Durchmesser von weniger als 100 um, vorteilhafterweise einen Durchmesser von weniger als 10 um, aufweisen. 2. Material according to claim 1, characterized in that the fibers are made of glass and have a diameter of less than 100 µm, advantageously a diameter of less than 10 µm.
3. Material gemäss Patentanspruch 1, dadurch gekennzeichnet, dass die Poren zwischen den Fasern ein kontinuierliches, untereinander verbundenes Öffnungssystem bilden. 3. Material according to claim 1, characterized in that the pores between the fibers form a continuous, interconnected opening system.
4. Material gemäss Patentanspruch 1, dadurch gekennzeichnet, dass es zusätzlich mit Polymeren imprägniert ist. 4. Material according to claim 1, characterized in that it is additionally impregnated with polymers.
5. Material gemäss Patentanspruch 4, dadurch gekennzeichnet, dass es zusätzlich mittels eines aushärtenden Polymerharzes imprägniert ist. 5. Material according to claim 4, characterized in that it is additionally impregnated by means of a curing polymer resin.
6. Material gemäss den Patentansprüchen 4 und 5, dadurch gekennzeichnet, dass das aushärtende Polymer-Harz ein Harz auf der Basis von Methylmethacrylat ist. 6. Material according to claims 4 and 5, characterized in that the curing polymer resin is a resin based on methyl methacrylate.
7. Material gemäss Patentansprüchen 4 und 5, dadurch gekennzeichnet, dass das aushärtende Polymer-Harz ein Harz auf der Basis von Epoxy-Kunststoff ist. 7. Material according to claims 4 and 5, characterized in that the curing polymer resin is a resin based on epoxy.
8. Material gemäss Patentanspruch 4, dadurch gekennzeichnet, dass es zusätzlich mittels eines Elastomeren imprägniert ist. 8. Material according to claim 4, characterized in that it is additionally impregnated by means of an elastomer.
9. Material gemäss Patentanspruch 8, dadurch gekennzeichnet, dass das Elastomere ein Silikonharz ist. 9. Material according to claim 8, characterized in that the elastomer is a silicone resin.
10. Verfahren zur Herstellung des Verstärkungs-, Fülloder Haltematerials gemäss Patentanspruch 1, dadurch gekennzeichnet, dass dazu die anorganischen Fasern mittels Einwirkung von Hitze und Druck an den gegenseitigen Berührungspunkten miteinander verschmolzen werden. 10. A method for producing the reinforcing, filling or holding material according to claim 1, characterized in that for this purpose the inorganic fibers are fused together by the action of heat and pressure at the mutual points of contact.
Die vorliegend beschriebene Erfindung betrifft ein Ver-stärkungs-, Füll- oder Haltematerial zur Verwendung in der Dentaltechnik sowie ein Verfahren zur Herstellung des genannten Materials. The present invention described relates to a reinforcing, filling or holding material for use in dental technology and a method for producing the material mentioned.
Ein Verstärkungs-, Füll- oder Haltematerial zum Gebrauch in der Dentaltechnik sollte ähnliche physikalische Eigenschaften aufweisen, wie die Zahnsubstanz selber. Das Material sollte also ähnlich aussehen und ungefähr gleiche Festigkeiten und Abriebbeständigkeiten aufweisen. Andere, wichtige Eigenschaften solcher Materialien sind diejenigen, die die Bildung von Mikrolecken zwischen dem Zahn und dem Füllmaterial betreffen. In dieser Hinsicht sind wichtig der thermische Ausdehnungskoeffizient, die auf die Polymerisation zurückzuführende Kontraktion und sehr wahrscheinlich auch die viskoelastischen Eigenschaften des Füllmaterials. A reinforcing, filling or holding material for use in dental technology should have physical properties similar to those of the tooth substance itself. The material should look similar and have approximately the same strength and abrasion resistance. Other important properties of such materials are those related to the formation of micro-leaks between the tooth and the filler. In this regard, the thermal expansion coefficient, the contraction due to the polymerization and very likely also the viscoelastic properties of the filler material are important.
Aus den genannten Gründen folgt, dass eine erfolgreiche Füllmaterialmischung möglichst wenig organisches Polymer enthalten soll. Dadurch wird der Einfluss der organischen Verbindung als schwächstes Verbindungsglied verringert. Ebenso ist darauf zu achten, dass zwischen dem anorganischen Anteil und dem organischen Anteil des Füllmaterials eine genügend starke und stabile Verbindung hergestellt werden kann. For the reasons mentioned, it follows that a successful filler mixture should contain as little organic polymer as possible. This reduces the influence of the organic compound as the weakest link. It is also important to ensure that a sufficiently strong and stable connection can be made between the inorganic portion and the organic portion of the filler.
Bei Abwesenheit einer genügend starken und stabilen Verwendung können zum Beispiel Füllstoffteilchen aus dem Material entfernt werden. Ebenso kann Wasser zwischen den Füllstoff und den Binder eindringen. Das letztere stellt vermutlich den Hauptgrund für die ungenügende Beständigkeit gegen Einschlussabrieb der heute verwendeten, sogenannten Zahnrestaurationsfüllmaterialien dar. In the absence of sufficiently strong and stable use, filler particles can be removed from the material, for example. Water can also penetrate between the filler and the binder. The latter is probably the main reason for the insufficient resistance to inclusion wear of the so-called dental restorative filling materials used today.
Um einen niedrigen Polymergehalt des Füllmaterials zu s erreichen, wird heute vielfach darauf geachtet, das anorganische Füllmaterial mit einer günstigen Kornverteilung einzusetzen. Die letztere sollte so breit wie möglich sein. Durch den Einbau von grossen und sehr abrasionsbeständigen Teilchen kann das Füllmaterial jedoch in dem Sinn ungünstig io beeinfiusst werden, dass seine Oberfläche sehr rauh und uneben wird. Diese Unebenheit wird durch die verschiedene Abnützung des Füllmaterials und des Binders noch erhöht. In order to achieve a low polymer content of the filling material, care is often taken today to use the inorganic filling material with a favorable particle size distribution. The latter should be as wide as possible. By installing large and very abrasion-resistant particles, however, the filling material can be adversely affected in the sense that its surface becomes very rough and uneven. This unevenness is further increased by the different wear of the filling material and the binder.
Es ist nun der Zweck dieser Erfindung, ein Verstärkungs-, Füll- oder Haltematerial zu schaffen, welches die genannten 15 Anforderungen in bezug auf Aussehen, Festigkeit, Steifheit und Abriebbeständigkeit erfüllt und sich zudem noch gut eignet zum Herstellen einer festen Verbindung zwischen lebendem Gewebe und dem Material. It is now the purpose of this invention to provide a reinforcing, filling or holding material which fulfills the 15 requirements in terms of appearance, strength, rigidity and abrasion resistance and which is also well suited for establishing a firm connection between living tissue and the material.
Das erfindungsgemässe Verstärkungs-, Füll- oder Hal-20 tematerial zur Verwendung in der Dentaltechnik ist im vorangehenden Patentanspruch 1 charakterisiert. The reinforcing, filling or holding material according to the invention for use in dental technology is characterized in the preceding patent claim 1.
Dieser Beschreibung liegen zwei vergrösserte fotographische Aufnahmen des erfindungsgemässen Materials bei. This description is accompanied by two enlarged photographs of the material according to the invention.
Die Verschmelzung der Fasern oder Fäden an ihren Be-25 rührungspunkten führt zu sehr festen, materialgleichen Verbindungen des anorganischen Füllmaterials. The fusion of the fibers or threads at their contact points leads to very firm, material-like connections of the inorganic filler.
Das poröse, anorganische Material kann mit Vorteil mit Polymeren imprägniert sein. Da die Poren zwischen den Fasern oder Fäden ein kontinuierliches Öffnungssystem bilden, 30 kann die Imprägnierung bis zu sehr grossen Tiefen des Materials ausgeführt werden. Die Imprägnierung führt zu ver-grösserter Festigkeit und Steifheit des Materials. Ebenso wird dessen Abriebfestigkeit erhöht. Polymere, welche in diesem Zusammenhang mit Vorteil als Imprägnierungsmittel 35 eingesetzt werden können, sind alle aushärtenden, d.h. alle thermisch aushärtenden oder thermoplastischen Harze. Beispiele solcher Harze sind Methylmethacrylat-Harz, Epoxy-Harze oder eine Kombination von Methylmethacrylat- und Epoxy-Harzen. Die letzte Kombination ist unter dem Han-40 delsnamen «Bowen-Resin» erhältlich. The porous, inorganic material can advantageously be impregnated with polymers. Since the pores between the fibers or threads form a continuous opening system, the impregnation can be carried out to very great depths of the material. The impregnation leads to increased strength and rigidity of the material. Its abrasion resistance is also increased. Polymers which can advantageously be used as impregnating agents 35 in this context are all curing, i.e. all thermosetting or thermoplastic resins. Examples of such resins are methyl methacrylate resin, epoxy resins or a combination of methyl methacrylate and epoxy resins. The last combination is available under the trade name "Bowen-Resin".
Die Steifheit-, Verstärkungs- und Hafteigenschaften des erfindungsgemässen Materials zeigen sich speziell gut, wenn die Fasern oder Fäden aus Glas bestehen. Um zu erreichen, dass das Material auch eine günstige Oberflächenstruktur er-45 hält, sollte der Durchmesser der Fasern 100 um, mit Vorteil sogar 10 |im, nach dem Sintern nicht übersteigen. The stiffness, reinforcement and adhesive properties of the material according to the invention are particularly good when the fibers or threads are made of glass. In order to ensure that the material also has a favorable surface structure, the diameter of the fibers should not exceed 100 μm, advantageously even 10 μm, after sintering.
Eine genügende Befestigung des Implantats am lebenden Gewebe erfordert entweder eine sehr gute Haftung oder eine mechanische Verstrebung. Beides kann zum Beispiel da-50 durch erreicht werden, dass das Füllmaterial in Oberflächenporen des Zahnmaterials hineinwachsen kann. Das Material gemäss der Erfindung erfüllt nun beide Voraussetzungen im hohen Masse. Sufficient attachment of the implant to the living tissue requires either very good adhesion or mechanical bracing. Both can be achieved, for example, by the filling material being able to grow into surface pores of the tooth material. The material according to the invention now fulfills both requirements to a high degree.
Um die ausgezeichnete Verbindung der einzelnen Fasern 55 oder Fäden durch Verschmelzung untereinander zu erreichen, ist es nötig, dieselben mittels einer geeigneten Wärmequelle zu erhitzen oder mittels Vibration der Fasern dieselben zu erhitzen und sie an ihren Berührungspunkten zum Verschmelzen zu bringen. In order to achieve the excellent connection of the individual fibers 55 or threads by fusing them to one another, it is necessary to heat them by means of a suitable heat source or to heat them by means of vibration and to bring them to fuse at their contact points.
6o Es folgt nun ein Beispiel für eine Ausführungsform des erfindungsgemässen Materials sowie ein Beispiel für ein Herstellungsverfahren desselben Materials. 6o There now follows an example of an embodiment of the material according to the invention and an example of a production method of the same material.
Beispiel example
65 Zur Herstellung des erfindungsgemässen Materials wurde von Glasfasern des Typs A der Firma Gullfiber AB, Bil-lesholm, Schweden, ausgegangen. Diese Glasfasern weisen einen extrem kleinen Durchmesser von < 4 um auf. Durch 65 To produce the material according to the invention, type A glass fibers from Gullfiber AB, Bil-lesholm, Sweden, were used. These glass fibers have an extremely small diameter of <4 µm. By
3 3rd
632 408 632 408
eine kombinierte Hitze- und Druckbehandlung wurde erreicht, dass die Fasern an ihren Berührungspunkten zusammenschmolzen und so zu einem dichten, dreidimensionalen Netzwerk wurden. Das Netzwerk wurde anschliessend mit Bowen-Harz (Epoxylite® HL-72) imprägniert. Die Imprägnierung geschah mittels einer Vakuummethode, die ähnlich derjenigen war, welche für die Herstellung eines Gips-Polymermaterials verwendet wird (Ehrnford, 1972, schwedische öffentliche Patentspezifikation Nr. 362 060). A combined heat and pressure treatment was achieved so that the fibers melted together at their points of contact and thus became a dense, three-dimensional network. The network was then impregnated with Bowen resin (Epoxylite® HL-72). The impregnation was done using a vacuum method similar to that used to make a gypsum polymer material (Ehrnford, 1972, Swedish Public Patent Specification No. 362 060).
Für rasterelektronen-mikroskopische Aufnahmen wurden Flächen aus erfindungsgemässen Material einer Schichtdicke von 250 (im hergestellt. Zur Herstellung wurden Glasfaserschichten zwischen Glimmerplatten auf ungefähr 650 °C erwärmt und einem Druck von ungefähr 4000 Pa unterworfen. For scanning electron micrographs, areas were produced from material according to the invention with a layer thickness of 250 μm. For the production, glass fiber layers between mica plates were heated to approximately 650 ° C. and subjected to a pressure of approximately 4000 Pa.
Unter Rotation der Probekörper wurden diese im Vakuum mit einer ungefähr 200 À dicken Schicht einer Palladium-Gold-Legierung versehen. Das Aufbringen der Metallschicht geschah mittels Aufdampfen, die Zusammensetzung der Legierung betrug 40% Palladium und 60% Gold. While rotating the test specimens, they were vacuum-coated with an approximately 200 À thick layer of a palladium-gold alloy. The metal layer was applied by evaporation, the composition of the alloy was 40% palladium and 60% gold.
Die Morphologie der direkt an die Glimmerplatten anschliessenden Schichten des Materials wurden mit einem Elektronenmikroskop (Cambridge Stereoscan Mark II) untersucht. Es wurden fotographische Aufnahmen auf Ilford Pan F-Film gemacht. The morphology of the layers of material directly adjoining the mica plates were examined with an electron microscope (Cambridge Stereoscan Mark II). Photographs were taken on Ilford Pan F film.
Im Fasernetzwerk kann das Polymer sich chemisch mit dem Matrixpolymer verbinden. Auch eine mechanische Verstrebung des Verstärkungsmaterials kann erreicht werden. In the fiber network, the polymer can chemically combine with the matrix polymer. A mechanical bracing of the reinforcing material can also be achieved.
Ein Netzwerk, wie es im obigen Beispiel erhalten wird, kann auch als Aufnahmematerial vor dem Imprägnieren verwendet werden. Dies kann zum Beispiel in der Form einer Oberflächenbeschichtung auf einem Implantat geschehen. A network as obtained in the example above can also be used as the recording material before impregnation. This can be done, for example, in the form of a surface coating on an implant.
Die Fotoaufnahmen des erfindungsgemässen Materials zeigen, dass die Fasern zu einem Glasgerüst zusammenge-schweisst sind. Das Gerüst umschliesst ein Mikroporensy-stem. Eben dieses Glasgerüst kann nun als eigentliches Auf-5 nahmeelement verwendet werden. Es zeigt eine günstige Struktur in bezug auf Festigkeiten, Steifheit und Haftung. Die Oberfläche des Materials ist flach und eben und es zeigen sich keine Defekte, welche auf Bruchstellen hinweisen können. The photographs of the material according to the invention show that the fibers are welded together to form a glass frame. The scaffold encloses a microporous system. This glass frame can now be used as the actual receiving element. It shows a favorable structure in terms of strength, rigidity and adhesion. The surface of the material is flat and even and there are no defects that can indicate break points.
io Die Bilder zeigen ganz eindeutig, dass die Fasern zu einem dreidimensionalen Netzwerk verschmolzen wurden. Die Öffnungen zwischen den Fasern bilden ein durchgehendes Hohlraumsystem, wodurch gewährleistet wird, dass das Material bis in grosse Tiefen imprägniert werden kann. Eine sol-15 che tiefe Imprägnierung kann sehr wichtig sein, wenn grössere Materialkörper verwendet werden. Nachdem solche grössere Körper imprägniert und ausgehärtet worden sind, können diese zum Beispiel als spezielle Füllstoffe verwendet werden. In dieser letzteren Verwendung muss das Bindemit-20 tel nicht unbedingt mit dem Imprägnierungsmittel übereinstimmen. io The pictures clearly show that the fibers have been fused into a three-dimensional network. The openings between the fibers form a continuous cavity system, which ensures that the material can be impregnated to great depths. Such a deep impregnation can be very important if larger material bodies are used. After such large bodies have been impregnated and cured, they can be used as special fillers, for example. In this latter use, the binding agent does not necessarily have to match the impregnating agent.
Aus der Tatsache, dass sowohl für das anorganische Netzwerk wie auch für das organische Imprägnierungsmittel verschiedene Stoffe verwendet werden können, folgt, dass 25 das erfmdungsgemässe Material nach dessen Imprägnierung für sehr verschiedene Verwendungen eingesetzt werden kann. Es können vor allem die Eigenschaften des Materials als Füllstoff beeinfiusst werden. From the fact that different substances can be used both for the inorganic network and for the organic impregnating agent, it follows that the material according to the invention can be used for very different uses after its impregnation. Above all, the properties of the material as a filler can be influenced.
Für den Fachmann ist es klar, dass das erfindungsgemäs-30 se Material und dessen Verwendung in bezug auf Zusammensetzungen, Anwendungen usw. verschiedenen Änderungen und Modifikationen unterworfen werden kann, ohne dass dadurch der Bereich dieser Erfindung verlassen wird. It is clear to a person skilled in the art that the material according to the invention and its use with regard to compositions, applications etc. can be subjected to various changes and modifications without thereby leaving the scope of this invention.
2 Blatt Zeichnungen 2 sheets of drawings
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7603313A SE411613B (en) | 1976-03-16 | 1976-03-16 | STRENGTH AND REINFORCEMENT ELEMENTS AND / OR Retention elements |
Publications (1)
Publication Number | Publication Date |
---|---|
CH632408A5 true CH632408A5 (en) | 1982-10-15 |
Family
ID=20327313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH320077A CH632408A5 (en) | 1976-03-16 | 1977-03-15 | Reinforcing, filling or HOLD MATERIAL FOR USE IN DENTAL TECHNOLOGY. |
Country Status (9)
Country | Link |
---|---|
US (2) | US4392828A (en) |
BE (1) | BE852458A (en) |
CA (1) | CA1107879A (en) |
CH (1) | CH632408A5 (en) |
DE (1) | DE2711014A1 (en) |
FR (1) | FR2344280A1 (en) |
GB (1) | GB1581067A (en) |
NL (1) | NL189647C (en) |
SE (1) | SE411613B (en) |
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-
1976
- 1976-03-16 SE SE7603313A patent/SE411613B/en not_active IP Right Cessation
-
1977
- 1977-03-14 DE DE19772711014 patent/DE2711014A1/en active Granted
- 1977-03-14 CA CA273,929A patent/CA1107879A/en not_active Expired
- 1977-03-15 GB GB10931/77A patent/GB1581067A/en not_active Expired
- 1977-03-15 BE BE175787A patent/BE852458A/en not_active IP Right Cessation
- 1977-03-15 CH CH320077A patent/CH632408A5/en not_active IP Right Cessation
- 1977-03-15 NL NLAANVRAGE7702774,A patent/NL189647C/en not_active IP Right Cessation
- 1977-03-15 FR FR7707599A patent/FR2344280A1/en active Granted
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1981
- 1981-01-21 US US06/226,636 patent/US4392828A/en not_active Expired - Fee Related
- 1981-09-17 US US06/302,995 patent/US4381918A/en not_active Expired - Fee Related
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NL189647C (en) | 1993-06-16 |
SE411613B (en) | 1980-01-21 |
GB1581067A (en) | 1980-12-10 |
US4392828A (en) | 1983-07-12 |
DE2711014C2 (en) | 1989-01-19 |
NL7702774A (en) | 1977-09-20 |
FR2344280A1 (en) | 1977-10-14 |
NL189647B (en) | 1993-01-18 |
BE852458A (en) | 1977-07-01 |
CA1107879A (en) | 1981-08-25 |
SE7603313L (en) | 1977-09-17 |
DE2711014A1 (en) | 1977-09-29 |
US4381918A (en) | 1983-05-03 |
FR2344280B1 (en) | 1982-11-19 |
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Owner name: AUSTENAL INTERNATIONAL, INC. |
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